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We’ve all seen the dramatic images of vast parts of the ocean caked in oil; birds and other wildlife stuck in the thick, dark liquid. These spills are both environmentally damaging and expensive to clean up.

As the chart shows, in the 1970s, over 300,000 tonnes of oil were spilled from oil tankers in most years. By the 1980s and 1990s, this had dropped, but the annual average was still over 100,000 tonnes.

These losses have fallen dramatically since the millennium. Last year, 10,000 tonnes were spilled, less than one-thirtieth of the amount lost in a typical year in the 1970s.

This decline has occurred despite global oil production and trade increasing dramatically.

We’ve just updated our charts on oil spills; explore the latest data →

Many countries receive some foreign aid, but it typically accounts for just a few percent of their income. But during periods of conflict, crisis, or natural disaster, foreign aid forms a large part of some countries’ economy.

The map shows the countries where aid was more than one-fifth of national income in 2023 (the latest year of data available). This included Yemen, Syria, and the Central African Republic, which experienced continued conflict, and Ukraine, which received humanitarian aid following the Russian invasion.

Since aid is often given during periods of acute fragility and humanitarian crises, the countries on this list change a lot from year to year. If you look at the trend for Haiti, for example, you can see a spike in aid after the devastating earthquake that hit Port-au-Prince in 2010.

During these events, aid often plays a crucial role in providing basic resources and support for countries trying to rebuild.

Explore data on who gives foreign aid, who receives it, and how this has changed over time →

As countries get richer, the type of work that people do changes a lot.

The chart breaks down the workforce by sector by country income groups. In most low-income countries, a majority of people work in agriculture. People grow their own food, get a surplus to sell to others, or produce commodities that they can export overseas.

In comparison, fewer people work in farming in middle- and high-income countries. People start to move to industrial and service jobs instead.

In rich countries, three-quarters of workers are employed in services, compared to just 3% in agriculture.

There are several drivers of this. Agricultural productivity tends to increase as countries get richer (and they gain access to better seeds, fertilizers, irrigation, and land). This means fewer family members must work on the farm to produce the same — or more — income.

At the same time, many industrial and service jobs pay more, so people are incentivized to move out of farming to higher-paying roles when they become available. This transition has been a key driver of economic growth and poverty reduction for many countries.

Read my article on why improvements in agricultural productivity are important to reduce poverty →

As conflicts break out across the world, the threat of nuclear war is never far from many people’s minds.

One of the first questions we need to answer to better understand the risks of nuclear weapons is: which countries have them, and in what quantity? The chart shows estimates of national stockpiles in 2025.

The exact number of warheads is secret, so these are some of the best estimates based on publicly available information, historical records, and occasional leaks.

Nine countries are thought to have nuclear weapons today, but over 80% of warheads are held by just two: Russia and the United States.

While the number of countries that possess nuclear weapons has never been higher, the total number of warheads and tests being carried out is lower than they were a few decades ago.

Read our colleague Max Roser’s article on why nuclear war is a key concern of our generation →

Forty years ago, public views about homosexuality were extremely negative in many rich countries. As the chart shows, back in 1984, one in three Dutch people believed homosexuality was “never or rarely justified”. In Spain and Great Britain, that view was held by the majority. Perhaps most strikingly, three-quarters of Americans thought the same.

Since then, levels of discrimination have plummeted. Today, the share of people in these countries who think that homosexuality is “never or rarely justified” makes up a shrinking minority. That’s good news — everyone should be free to decide for themselves who they are attracted to.

It might sound odd today to ask whether someone else’s sexuality is justified. But that’s how the long-running World Values Survey phrased it when they began decades ago. Keeping the phrasing consistent helps show how attitudes have changed, but the fact that it may sound outdated now is, in itself, a reflection of how much has changed.

Explore responses to this question in more than a hundred countries →

As someone who studies the transition to low-carbon energy, I am always on the lookout for electric cars in everyday life. I like to see how common they are, and it has been exciting to see their prominence grow on the roads in the UK.

Last year, more than one in five new cars sold globally were electric. But how does this vary worldwide? This share is shown across a selection of countries in the chart (more are available here).

Norway leads the world by a long way, with almost all new cars there being electric. China is another standout, with nearly half of new sales.

At the bottom, you can see that electric cars are still relatively rare in countries like Japan, Brazil, and India.

In most countries, greenhouse gas emissions from transport have either grown or, at best, stagnated in the last decade. Accelerating the transition to electric vehicles will be crucial to pushing emissions downwards.

Note that “electric” here includes fully-electric and plug-in hybrid cars; you can see the contribution of each here.

Explore data on electric car sales and stocks across countries in our latest update →

For the first time, in 2024, more than half of the electricity produced in the Netherlands came from renewable sources, and almost all of it (45%) from solar and wind.

As the chart shows, this has been a sharp and recent shift. Even as recently as 2018, over 80% of Dutch electricity was generated by fossil fuels.

The Dutch government signed a national climate accord in 2019 that introduced more than 600 measures to accelerate the shift to low-carbon power. These included further stimulation of solar and wind energy, a rising carbon tax, and the closure of a major coal plant. A rapid surge in renewable electricity followed, with solar and wind growing from 14% to 45% of the electricity mix.

See how each source contributes to the Dutch electricity mix →

Just a century ago, many of today’s independent countries weren’t self-governing at all. They were colonies controlled by European countries from far away.

Modern European colonialism began in the 15th century, when Spain and Portugal established overseas empires. By the early 20th century, it had peaked: the United Kingdom and France dominated, and nearly 100 modern-day countries were under European control, mostly in Africa, Asia, and the Caribbean.

As the chart shows, this changed rapidly after World War II. A wave of decolonization spread across the world, especially in the 1950s and 1960s. Colonies became independent countries, formed their own governments, joined international institutions, and started having their own voice in global decisions.

The decline of colonialism marked one of the biggest political shifts in modern history, from external rule to national sovereignty.

Read more about colonization and state capacity on our dedicated page →

Economic growth is easy to understand: it means that people have access to goods and services of increasing quantity and quality.

What is hard, however, is to measure economic growth. This chart shows two ways of doing this for US growth over the past 160 years.

The purple lines represent a straightforward approach: each line tracks the share of households with access to one specific good or service. Starting from the top, you see the rising provision of basic infrastructure like running water, flush toilets, and electric power. You can also see the increasing availability of communication technology: radios, TVs, the Internet, and mobile phones. And further down, you see the rise of technologies that reduced work at home: vacuum cleaners, washing machines, dryers, and dishwashers.

This approach is very concrete; it shows practical ways in which the production and consumption of specific goods increased over time. The downside is that it only captures a limited number of particular goods. Millions of goods and services are produced and consumed, and most are not recorded with such precision.

A way to measure how people’s access to the full range of goods and services changes is to measure people’s incomes. This way of measuring growth is shown in the top left panel. The data on average income, here measured by GDP per capita, tells us that the average American was 13 times poorer in 1860 than in 2022 (adjusted for inflation).

These two ways of measuring economic growth have pros and cons: one is concrete but not comprehensive, the other is comprehensive but quite abstract. If we want to understand what growth means for our societies, I find it helpful to combine them both.

If you want to know more about this — and see how the inequality of incomes can be factored in — you can read my article: “What is economic growth? And why is it so important?” →

When I was born in the 1990s, the average carbon dioxide (CO2) emissions in the United Kingdom were about six times higher than in China, but these trends have converged in my lifetime.

You can see this in the chart: in 2022, China’s per capita emissions matched those in the UK.

Once a country that ran on coal, the UK has closed its last coal plant. This has been the main driver of its emissions decline.

Meanwhile, rapid economic growth, powered mainly by coal, has ramped up emissions in China.

These emission numbers are adjusted for trade. Based on domestic production, China’s per capita emissions are much higher than the UK's. But since China is a net exporter of goods (and emissions) and the UK is a net importer, the gap closes when we adjust for consumption.

These emissions are based on domestic consumption and do not include international aviation or shipping, where Brits are likely to emit more.

There are many ways to compare national contributions to climate change; explore them here →

Smokers are about 21 times more likely to die from lung cancer than people who never smoked, and they face increased risks from over a dozen other diseases. I know people who died from smoking: you probably do too.

In 2008, the World Health Organization created a set of tobacco control policies with different tiers, the highest of which are considered “best practices” — they are listed on the chart.

The chart also shows the share of the global population living in countries that had enacted these policies as of 2007 and 2024.

What surprised me is how recent most of these policies still are. In 2007, only a tiny share of the global population benefited from these policies. Since then, coverage has increased across all these measures, but most of them still reach less than half of the world's population.

What is the share of taxes on the retail price of a pack of cigarettes? See the data for each country →

For most of history, almost everyone everywhere was very poor. Hunger was common, half of the children died, and, as the chart shows, average incomes were low across all regions.

The chart also shows how people’s incomes have changed over the last two centuries. The chart highlights a stark divergence: while average incomes in every region have increased, the pace of this growth has varied enormously. Western Europe and the “Western Offshoots” (like the US and Australia) experienced early and sustained economic growth. Meanwhile, Sub-Saharan Africa and South Asia grew much more slowly.

Two hundred years ago, people in all regions were similarly poor. Today, the average incomes of people in Australia, the US, or Denmark are more than 15 times higher than those in Sub-Saharan Africa.

I wrote an article on how economic growth is possible and why it is important: “What is economic growth?” →

Norway is leading the way in the transition from petrol to electric cars. Almost every new car sold in Norway is electric. Hardly anyone buys a combustion engine car anymore.

However, data on new car sales doesn’t tell us about the distribution of cars on the road. There is a lag between sales and stocks, because people can hold on to their existing petrol and diesel cars for as much as a decade or more.

But after years of electric cars dominating the market, one-third of cars in use in Norway are now electric. The chart shows this growth.

The share was only 12% five years earlier, which shows that this transition can happen relatively quickly.

As the global leader, Norway’s experiences can help to inform other countries on factors like charging networks, grid management, and the impacts of electric car uptake on emissions and air quality.

See how common electric cars are in other countries across the world →

The Agricultural Revolution — the transition from hunting and gathering to farming — didn’t end hunger. That’s because more food didn’t mean more per person: it meant more people.

The English cleric Thomas Malthus predicted this would continue forever: food production would always be outpaced by population growth, making lasting progress against hunger impossible.

But at least since the mid-20th century, England has left mass hunger behind. How was this possible? How did English farmers prove Malthus wrong?

The chart shows one central part of the answer. For centuries, cereal yields in England — for staples like wheat and barley — were stuck at about 0.6 tonnes per hectare. That means farmers needed a plot of 100 meters by 100 meters to grow 600 kilograms of cereals per year. Hunger was widespread.

But this changed from the 17th century onward, accelerating a hundred years ago. In a dramatic transformation known as the Second Agricultural Revolution, farmers found ways to grow much more food on the same land.

Today, after four centuries of rising productivity, English farmers are growing about ten times more food on the same land than in the past. This has made it possible to increase food production faster than population growth, breaking England out of the “Malthusian Trap”.

The chart also shows that the world as a whole is changing in the same direction. Global average yields have tripled in the last six decades. Today, yields are already about five times higher than in England in the past. If yields continue to follow this trajectory, it would bring us much closer to the end of global hunger, while also sparing land for nature.

My colleague Hannah Ritchie wrote about how climate change might affect crop yields in the future →

It’s hard to imagine many things that are more terrifying than your baby contracting HIV. This is the reality for around 130,000 families every year.

Just a few decades ago, this figure was over half a million. Most of these infections were passed on from mothers who had HIV themselves.

But the introduction of anti-retroviral (ART) drugs and other interventions has meant that most infections can be prevented. If the mother takes ART during pregnancy, it dramatically reduces the risk of passing on HIV. In some cases, giving ART to the baby in the first few weeks of life can help too.

In the chart, you can see this decline in new HIV infections in children. On top, you can see the huge number of cases estimated to have been averted thanks to these interventions; they amount to almost a quarter of a million cases every year.

Explore more of our work on HIV/AIDS in adults and children →

Global trade has never been a bigger slice of the world economy. However, China, the country that most people think of as the export giant, has seen a decline in its trade-to-GDP ratio in the last 15 years.

The chart shows China’s trade in goods and services as a share of its Gross Domestic Product (GDP). In 1970, it was just 5%. Following Deng Xiaoping's economic reforms, which opened China to market forces and international trade, this figure soared to 64% in 2006. But since then, it has fallen considerably, reaching 37% in 2023 — still far higher than before the 1990s. China's exports have grown in dollar terms, but its economy has expanded even faster, making trade a shrinking share of the whole.

While the 2008 financial crisis disrupted global trade, China’s trajectory also reflects the increase in domestic demand for its products. The decline in the trade-to-GDP ratio since 2006 reflects a shift from export-led growth toward domestic consumption, not a return to pre-reform levels. For years, Chinese officials have advocated rebalancing the economy away from export dependence and toward one driven by domestic consumption. A rising middle class now buys more of what China produces, reducing its reliance on international markets.

Explore more data on our Trade and Globalization page →